Abstract
Generally cores are produced by the same techniques as molds. Small- and medium-size cores are often blown or shot into the core box. Molding sands can differ from each other according to their composition, binding methods, and consistency. A few systems, taking into account dividing of sands in dependence of the assumed criterion, were developed. Molding sands can be divided in dependence of their destination, the function which they have in molds, or a wear degree. Assuming the chemical character of the binding material as the criterion, there are inorganic or organic binders. The temperature, at which a hardening process of binders occurs, can be also the dividing criterion: room temperature, increased temperature, or high temperature.
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